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Temperature compensation offset eliminated RC oscillator

A temperature compensation, oscillator technology, applied in pulse generation, electrical components, generation of electrical pulses, etc., can solve problems such as oscillator output frequency error, and achieve the effect of improving accuracy, improving performance, and eliminating the effect of affecting output frequency accuracy.

Inactive Publication Date: 2012-05-30
宿迁亿立达半导体有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

The error they introduce to the oscillator output frequency can be as high as 25%, which is clearly unacceptable

Method used

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  • Temperature compensation offset eliminated RC oscillator
  • Temperature compensation offset eliminated RC oscillator

Examples

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Embodiment Construction

[0024] An RC oscillator with temperature compensation and offset elimination described in an embodiment of the present invention includes a reference current generation module and a clock signal generation module. The reference current generation module consists of two operational amplifiers (1, 2), two current sources I1 and I2, two field effect transistors M1 and M2, resistor R and subtractor 3 are composed. The positive input terminals of the two operational amplifiers (1, 2) are respectively connected to the corresponding reference voltages VREF1 and VREF2. The two operational amplifiers The inverting input terminals of (1, 2) are respectively connected to the sources of the corresponding field effect transistors (M1, M2), and the output terminals of the two operational amplifiers (1, 2) are respectively connected to the corresponding field effect transistors (M1, M2). M2), one end of the two current sources (I1 and I2) are respectively connected to the sources of the corre...

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Abstract

The invention relates to a temperature compensation offset eliminated RC oscillator and a method thereof. The RC oscillator comprises a reference current generating module and a clock signal generating module, wherein the reference current generating module consists of two operational amplifiers, two current sources, two field-effect tubes, a resistor and a subtractor; the clock signal generatingmodule consists of a comparator, a buffer, a capacitor, a current source, a current sink and a current mirror; the input end of the current is connected with the output end of the subtractor; the output end of the comparator controls all switches of the RC oscillator; and a signal from the output end of the comparator passes through the buffer and then becomes an output clock signal of the RC oscillator. The temperature compensation offset eliminated RC oscillator has the advantages that: error sources, namely the resistance-temperature coefficient and input offset voltage of the comparator, influencing the output frequency of the oscillator in the conventional technology are eliminated, and the precision of the output frequency is greatly improved.

Description

technical field [0001] The invention relates to the field of CMOS integrated circuits, in particular to an RC oscillator for temperature compensation offset elimination and a realization method thereof. Background technique [0002] Digital circuits in mixed-signal chips usually require a clock signal with precise frequency. The clock signal is generated by an oscillator in the chip. RC oscillators have been widely researched and applied for their simple structure, high integration and good performance. In a conventional RC oscillator, the current mirror converts the current reference into a current source IP and a current sink IN, usually set IP=IN=k*VREF / R, k is a constant, VREF is a reference voltage, R is a resistance, and is determined by The two switches S1 and S2 are turned on alternately to switch the charging current source IP and the discharging current sink IN, and the two comparators are used to compare the capacitor voltage VC with the reference voltage VH and V...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K3/011
Inventor 闾建晶田道璟景春忠
Owner 宿迁亿立达半导体有限公司
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